practice code for Waveshare RP2040-LCD-1.28

main.c

// based on demo code https://www.waveshare.com/wiki/RP2040-LCD-1.28#Demo

#include "DEV_Config.h"
#include "GUI_Paint.h"
#include "LCD_1in28.h"
#include <stdio.h>

uint16_t gen_rgb565(uint16_t r, uint16_t g, uint16_t b) {
    uint16_t code = 0;
    code |= (r & 0b11111);
    code <<= 6;
    code |= (g & 0b111111);
    code <<= 5;
    code |= (b & 0b11111);
    return code;
}

int main(void) {
    if (DEV_Module_Init() != 0)
        return -1;
    LCD_1IN28_Init(HORIZONTAL);
    LCD_1IN28_Clear(WHITE);
    DEV_SET_PWM(60);    // set backlight
    UDOUBLE Imagesize = LCD_1IN28_HEIGHT * LCD_1IN28_WIDTH * 2;
    UWORD *BlackImage;
    if ((BlackImage = (UWORD *)malloc(Imagesize)) == NULL)
    {
        printf("Failed to apply for black memory...\r\n");
        exit(0);
    }
    Paint_NewImage((UBYTE *)BlackImage, LCD_1IN28.WIDTH, LCD_1IN28.HEIGHT, 0, WHITE);
    Paint_SetScale(65);
    Paint_Clear(WHITE);

    for (uint16_t y = 0; y < 240; y++)
        for (uint16_t x = 0; x < 240; x++)
            Paint_DrawPoint(x, y, gen_rgb565(x, y, 0), DOT_PIXEL_1X1, DOT_FILL_RIGHTUP);

    LCD_1IN28_Display(BlackImage);
    DEV_Delay_ms(1000);

    while (true)
    {
        DEV_Delay_ms(100);
    }

    free(BlackImage);
    BlackImage = NULL;

    DEV_Module_Exit();
    return 0;
}